Analytical and Experimental Study of Crack Closure Behavior Based on an S-Shaped Unloading Curve

D Chen; H Nisitani

doi:10.1520/STP27226S

SYMPOSIA PAPER Published: 01 January 1988

STP27226S

Analytical and Experimental Study of Crack Closure Behavior Based on an S-Shaped Unloading Curve

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Based on the S-shaped unloading hysteresis curve a new method for determining the crack closure has been developed in which the plastic deformation near the crack tip is taken into consideration. The crack growth rate can be expressed uniquely by the effective stress intensity range, ΔK_eff^op = K_max − K_op or ΔK_eff^cl = K_max − K_cl, which is independent of the stress ratio and the loading history. The tip of a nonpropagating crack does not open even under the maximum tensile load during one loading cycle. The measured values of the crack opening ratios U_op(ΔK_eff^op/K_max) and U_cl(ΔK_eff^cl/K_max) of a steadily propagating crack are mainly controlled by K_max and the stress ratio R.

Author Information

Chen, D

Jiang Nan University, Wuxi, China

Nisitani, H

Faculty of Engineering, Kyushu University, Higashi-ku, Fukuoka, Japan

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Details

Developed by Committee: E08

Pages: 475–488

DOI: 10.1520/STP27226S

ISBN-EB: 978-0-8031-5052-2

ISBN-13: 978-0-8031-0996-4

Analytical and Experimental Study of Crack Closure Behavior Based on an S-Shaped Unloading Curve

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